Electrostatic phase separation: A review

Mhatre, Sameer; Vivacqua, Vincenzino; Ghadiri, Mojtaba; Abdullah, Aboubakr M.; Al–Marri, Mohammed J.; Hassanpour, Ali; Hewakandamby, Buddhika N.; Kermani, Bijan

doi:10.1016/j.cherd.2015.02.012

Cited by 197 publications

(128 citation statements)

References 114 publications

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“…In the light of their observation, they concluded that the phenomenon of partial coalescence is the result of two simultaneous actions: (i) pumping, driven by capillary pressure and resisted by the viscous drag, and (ii) the deformation and break-up due to the electrostatic pressure induced on the droplets by the application of the electric field. The electric field type also affects the pattern of coalescence, with the application of pulsed DC fields being beneficial to the enhancement of the process efficiency (Bailes andLarkai, 1981, Mousavi et al, 2014;Vivacqua et al, 2015). With respect to the mitigation of incomplete coalescence, Mousavi et al (2014) report that the volume of the secondary droplets formed in the process decreases if pulse DC fields are employed, instead of constant fields.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of an externally applied electric field increases the rate of drainage of the oil film between two coalescing droplets (Mhatre et al, 2015). However, incomplete coalescence can occur when the field strength is excessively high (Mousavi et al, 2014;Mousavichoubeh et al, 2011a;2011b).…”

Section: Introductionmentioning

confidence: 99%

“…The application of an external electric field has been used in the petroleum industry to promote water droplet coalescence and facilitate separation of water-in-oil emulsions for many decades (Mhatre et al, 2015). The presence of an externally applied electric field increases the rate of drainage of the oil film between two coalescing droplets (Mhatre et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Linear dynamics modelling of droplet deformation in a pulsatile electric field

Vivacqua

Ghadiri

Abdullah

et al. 2016

Chemical Engineering Research and Design

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Resonance is possible only when the droplets are sufficiently large (i.e. for Ohnesorge number less than 1). The oscillation amplitude decreases rapidly with the electric field frequency. A qualitative comparison with some experiments of droplet-interface coalescence available in the literature has also been addressed, suggesting a correlation between the formation of secondary droplets and the amplitude of oscillation of the mother droplet. The outcomes of this analysis can be useful for the selection of the best operating conditions to improve the electrocoalescence process efficiency, as they can provide guidelines to the choice of the most suitable electric field parameters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Linear dynamics modelling of droplet deformation in a pulsatile electric field

Vivacqua

Ghadiri

Abdullah

et al. 2016

Chemical Engineering Research and Design

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“…In the presence of an electric field, the rate of film thinning between two coalescing droplets increases [1], but partial coalescence can occur if the field strength is too high [3][4][5][6]. The formation of small secondary droplets undermines the efficiency of the separation process; it would therefore be highly beneficial to understand the operating conditions that favour incomplete coalescence.…”

Section: Introductionmentioning

confidence: 99%

“…External electric fields are used in the oil industry to promote migration of droplets in the waterin-oil emulsions formed during the oil extraction process and to enhance their coalescence [1,2]. In the presence of an electric field, the rate of film thinning between two coalescing droplets increases [1], but partial coalescence can occur if the field strength is too high [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of partial electrocoalescence by Level-Set and finite element methods

Vivacqua

Ghadiri

Abdullah

et al. 2016

Chemical Engineering Research and Design

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The coalescence of a water drop in a dieletric oil phase at a water layer interface in the presence of an electric field is simulated by solving the Navier-Stokes and charge conservation equations with the finite element method. The proprietary software Comsol Multiphysics is used for this purpose.The interface between the oil and water phases is tracked by implementing a Level Set approach. The sensitivity of the model with respect to some input parameters are reported. In particular, the calculations are sensitive to the size of the computational grid elements, interface thickness and reinitialisation parameter. The ratio between the volume of secondary droplets and the initial drop volume is calculated as a function of the initial drop size and compared with experiments available in the literature. A good quantitative agreement can be obtained if the parameters are suitably tuned.The model also predicts a strong role played by the water phase conductivity in the formation of progeny droplets.

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Latest Insights and Methods in Analyzing Liquid Dense Clusters and Crystal Nucleation

Brognaro

Betzel

2018

Encyclopedia of Analytical Chemistry

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Liquid dense clusters (LDCs) are distinct membrane‐less microcompartments of molecules in aqueous solution, which arise in the process of liquid–liquid phase separation. LDC formation is observed most frequently in vivo during cell development, in neurodegenerative diseases and stress signaling, as well as in vitro, in liquid–solid phase transition. LDCs emerge spaciotemporally depending on the physicochemical environment, surface properties, and conformational flexibility of the molecules involved. Knowledge about structural and dynamic properties of growth and division of different macromolecule LDCs and other clustering phenomena, such as gels and fibers, is till now incomplete and only simplified thermodynamic models are available to predict some aspects of clustering so far. For example, for crystal growth a multistep mechanism is today most commonly accepted, starting with the early formation of LDCs, followed by a self‐organization within this LDCs and initial nucleation of an ordered crystal lattice. Therefore, insights about the LDCs formation and stability will also support directed optimization of macromolecule crystallization and will shed light on physiological LDC processes as well. Furthermore, it will support the establishment of new sample preparation and imaging techniques in structural biology utilizing latest and upcoming X‐ray imaging methods at high‐intensity radiation sources.

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Electrostatic phase separation: A review

Cited by 197 publications

References 114 publications

Linear dynamics modelling of droplet deformation in a pulsatile electric field

Linear dynamics modelling of droplet deformation in a pulsatile electric field

Analysis of partial electrocoalescence by Level-Set and finite element methods

Latest Insights and Methods in Analyzing Liquid Dense Clusters and Crystal Nucleation

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